| ID |
Date |
Author |
Subject |
|
120
|
Sun Nov 12 09:16:01 2017 |
CLW, PJW, TD | Run 106 | junk - ignore |
|
121
|
Sun Nov 12 09:17:49 2017 |
CLW, PJW, TD | Run 107 | Header: 4.29MeV/u 59Cu20+ + (CH2)n #16
Ender:
====================================================
Run number : 107
Date : 12.11.17
Start time : 10.18
Stop time : 12:18:52
Trigger rate (MIDAS) : 5
Blocks written : 514
Run Scalers (approx rates)
0- Ungated : 4
1- Gated : 4
2- dE : 120k
3- E : 27
4- HI : 719
5- Pulser : 1
6- Clock : 969
Beam energy (MeV/u) : 4.4
Beam intensity (epA) :
Target : (CH2)n #16
Ladder position (mm) : 128.95*
HI Degrader foil (um) : 10 um Al
del_E voltage (V) : -40
del_E leakage (uA) : -0.78
E voltage (V) : -350
E leakage (uA) : -2.12
E_hi voltage (V) : -14
E_hi leakage (uA) : -2.71
PA power (Up, positive) (A) : 1.55
PA power (Up, negative) (A) : 0.55
PA power (Down, positive) (A) : 0.8
PA power (Down, negative) (A) : 0.25
Pressure (IMG1) (mbar) : 6.3E-06
Pressure (old gauge) (mbar) : 1.8E-05
Pressure (SEC) (mbar) : 3.5E-06
Temp (Chiller) deg : -10
Temp (chamber) deg : 5.8
Comments: Dimo cleans laser c. 10.20-10.35
====================================================
* target ladder reading by Tom 128.95, by Claudia 127.95 and Phil says ~128. True position depends how good the
marker is lining up with scale
|
|
105
|
Sat Nov 11 15:17:24 2017 |
CLW, PJW, RG, TD, MD, DK | Run 95 | Header: Continue with 4.0 MeV/u on Carbon after laser cleaning
Ender:
====================================================
Run number : 95
Date : 11 / 11 / 2017
Start time : 16:16:21
Stop time : 18:07:05
Trigger rate (MIDAS) : 2 to 5
Blocks written : 65
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Run Scalars (approx rates)
0- Ungated : 3
1- Gated : 3
2- dE : 133658
3- E : 26
4- HI : 651
5- Pulser : 2
6- Clock : 969
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Beam energy (MeV/u) : Nominal 4.0 MeV/u
Beam intensity (epA) : 1.75ish pA
Target : C_25
Ladder position (mm) : 112.82 mm
HI Degrader foil (um) : 10 um Al
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
del_E voltage (V) : -40
del_E leakage (uA) : 0.67
E voltage (V) : -350
E leakage (uA) : 2.105
E_hi voltage (V) : -14
E_hi leakage (uA) : 2.55
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
PA power (Up, positive) (A) : 1.55
PA power (Up, negative) (A) : 0.55
PA power (Down, positive) (A) : 0.79
PA power (Down, negative) (A) : 0.25
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Pressure (IMG1) (mbar) : 7.0 x 10^-6
Pressure (old gauge) (mbar) : 2.0 x 10^-5
Pressure (SEC) (mbar) : 3.9 x 10^-6
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Temp (Chiller) deg : -9.9 to -10.2
Temp (chamber) deg : 5.8
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Comments: no beam for last few mins as we tested the radioactivity in the faradaycup with valve closed
==================================================== |
|
102
|
Sat Nov 11 11:21:22 2017 |
CLW, PJW, RG | Run 92 |
Header: 3.99 MeV/u and CH2_30+25. Beam is back
Ender:
====================================================
Run number : 92
Date : 11/11/17
Start time : 12:22:50
Stop time : 12:50:13
Trigger rate (MIDAS) : 2-4
Blocks written : 14
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Run Scalars (approx rates)
0- Ungated : 3
1- Gated : 3
2- dE : 140k
3- E : 69
4- HI : 686
5- Pulser : 2
6- Clock : 970
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Beam energy (MeV/u) : 3.99 MeV/u
Beam intensity (epA) :
Target : CH2_30+25 (Pos#6; 490-520 ug/cm2)
Ladder position (mm) : 67.26
HI Degrader foil (um) : 10 um Al
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
del_E voltage (V) : -40
del_E leakage (uA) : 0.67
E voltage (V) : -350
E leakage (uA) : 2.11
E_hi voltage (V) : -14
E_hi leakage (uA) : 2.50
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
PA power (Up, positive) (A) : 1.55
PA power (Up, negative) (A) : -0.55
PA power (Down, positive) (A) : 0.8
PA power (Down, negative) (A) : -0.28
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Pressure (IMG1) (mbar) : 7.2 E-06
Pressure (old gauge) (mbar) : 2.1 E-05
Pressure (SEC) (mbar) : 4.0 E-06
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Temp (Chiller) deg : -9.9
Temp (chamber) deg : 5.4
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Comments: Run had to be stopped early because some parts of the accelerator tripped. Miguel sorted it out remotely.
==================================================== |
|
103
|
Sat Nov 11 12:16:28 2017 |
CLW, PJW, RG | Run 93 |
Header: 3.99 MeV/u and CH2_30+25. Beam is back
Ender:
====================================================
Run number : 93
Date : 11/11/17
Start time : 13:17:12
Stop time : 15:00:51
Trigger rate (MIDAS) : 2-4
Blocks written : 57
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Run Scalars (approx rates)
0- Ungated : 3
1- Gated : 2
2- dE : 135k
3- E : 68
4- HI : 727
5- Pulser : 2
6- Clock : 970
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Beam energy (MeV/u) : 3.99 MeV/u
Beam intensity (epA) : ~1.5-2 pA
Target : CH2_30+25 (Pos#6; 490-520 ug/cm2)
Ladder position (mm) : 67.26
HI Degrader foil (um) : 10 um Al
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
del_E voltage (V) : -40
del_E leakage (uA) : 0.67
E voltage (V) : -350
E leakage (uA) : 2.11
E_hi voltage (V) : -14
E_hi leakage (uA) : 2.50
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
PA power (Up, positive) (A) : 1.55
PA power (Up, negative) (A) : -0.55
PA power (Down, positive) (A) : 0.8
PA power (Down, negative) (A) : -0.28
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Pressure (IMG1) (mbar) : 7.2 E-06
Pressure (old gauge) (mbar) : 2.1 E-05
Pressure (SEC) (mbar) : 4.0 E-06
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Temp (Chiller) deg : -10.0
Temp (chamber) deg : 5.6
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Comments:
==================================================== |
|
104
|
Sat Nov 11 14:15:12 2017 |
CLW, PJW, RG | Run94 | Header: 3.99 MeV/u and C_25.
Ender: We stop because the lasers are being cleaned, and we saw the scalars drop. See Comment below.
====================================================
Run number : 93
Date : 11/11/17
Start time : 15:09:09
Stop time : 16:08:46
Trigger rate (MIDAS) : 3
Blocks written : 35
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Run Scalars (approx rates)
0- Ungated : 3
1- Gated : 3
2- dE : 134k
3- E : 52
4- HI : 559
5- Pulser : 2
6- Clock : 970
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Beam energy (MeV/u) : 3.99 MeV/u
Beam intensity (epA) : ~1.5 pA
Target : C_25 (Pos#3; 430-500 ug/cm2)
Ladder position (mm) : 112.78
HI Degrader foil (um) : 10 um Al
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
del_E voltage (V) : -40
del_E leakage (uA) : 0.67
E voltage (V) : -350
E leakage (uA) : 2.11
E_hi voltage (V) : -14
E_hi leakage (uA) : 2.53
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
PA power (Up, positive) (A) : 1.55
PA power (Up, negative) (A) : -0.55
PA power (Down, positive) (A) : 0.8
PA power (Down, negative) (A) : -0.28
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Pressure (IMG1) (mbar) : 7.1 E-06
Pressure (old gauge) (mbar) : 2.0 E-05
Pressure (SEC) (mbar) : 4.0 E-06
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Temp (Chiller) deg : -10.1
Temp (chamber) deg : 5.5
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Comments: At around 16:00, the laser team goes in to do some cleaning. We are continuing to run while watching our scalars.
==================================================== |
|
122
|
Sun Nov 12 11:19:06 2017 |
CLW, PJW | Run 108 | Header: 4.29MeV/u 59Cu20+ + (CH2)n #16
Ender:
====================================================
Run number : 108
Date : 12.11.17
Start time : 12:18:59
Stop time : 14:25:38
Trigger rate (MIDAS) : 5
Blocks written :
Run Scalers (approx rates)
0- Ungated : 4
1- Gated : 4
2- dE : 125k
3- E : 32
4- HI : 573
5- Pulser : 1
6- Clock : 969
Beam energy (MeV/u) : 4.29 (as determined by operators)
Beam intensity (epA) : ~1.5 pA
Target : (CH2)n #16
Ladder position (mm) : 127.95
HI Degrader foil (um) : 10 um Al
del_E voltage (V) : -40
del_E leakage (uA) : -0.77
E voltage (V) : -350
E leakage (uA) : -2.11
E_hi voltage (V) : -14
E_hi leakage (uA) : -2.72
PA power (Up, positive) (A) : 1.55
PA power (Up, negative) (A) : 0.55
PA power (Down, positive) (A) : 0.8
PA power (Down, negative) (A) : 0.25
Pressure (IMG1) (mbar) : 6.2E-06
Pressure (old gauge) (mbar) : 1.8E-05
Pressure (SEC) (mbar) : 3.4E-06
Temp (Chiller) deg : -10
Temp (chamber) deg : 5.8
Comments:
====================================================
|
|
123
|
Sun Nov 12 13:24:51 2017 |
CLW, PJW | Run 109 | Header: 4.29MeV/u 59Cu20+ + (CH2)n #16
Ender: End
====================================================
Run number : 109
Date : 12.11.17
Start time : 14:25:46
Stop time : 16:26:07
Trigger rate (MIDAS) : 5
Blocks written : 505
Run Scalers (approx rates)
0- Ungated : 3
1- Gated : 3
2- dE : 124k
3- E : 35
4- HI : 608
5- Pulser : 2
6- Clock : 969
Beam energy (MeV/u) : 4.29 (as determined by operators)
Beam intensity (epA) :
Target : (CH2)n #16
Ladder position (mm) : 127.95
HI Degrader foil (um) : 10 um Al
del_E voltage (V) : -40
del_E leakage (uA) : -0.77
E voltage (V) : -350
E leakage (uA) : -2.11
E_hi voltage (V) : -14
E_hi leakage (uA) : -2.73
PA power (Up, positive) (A) : 1.55
PA power (Up, negative) (A) : 0.55
PA power (Down, positive) (A) : 0.8
PA power (Down, negative) (A) : 0.25
Pressure (IMG1) (mbar) : 6.1E-06
Pressure (old gauge) (mbar) : 1.8E-05
Pressure (SEC) (mbar) : 3.4E-06
Temp (Chiller) deg : -10
Temp (chamber) deg : 6.1
Comments:
====================================================
|
|
101
|
Sat Nov 11 09:20:56 2017 |
CLW, MD, PJW | Run 91 |
Header: 3.99 MeV/u and CH2_30+25. Beam is back
Ender:
====================================================
Run number : 91
Date : 11/11/17
Start time : 10:20:26
Stop time : 12:22:08
Trigger rate (MIDAS) : 4
Blocks written : 78
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Run Scalars (approx rates)
0- Ungated : 4
1- Gated : 3
2- dE : 135k
3- E : 66
4- HI : 788
5- Pulser : 2
6- Clock : 970
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Beam energy (MeV/u) : 3.99 MeV/u
Beam intensity (epA) : ~2 pA
Target : CH2_30+25 (Pos#6; 490-520 ug/cm2)
Ladder position (mm) : 67.26
HI Degrader foil (um) : 10 um Al
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
del_E voltage (V) : -40
del_E leakage (uA) : 0.65
E voltage (V) : -350
E leakage (uA) : 2.11
E_hi voltage (V) : -14
E_hi leakage (uA) : 2.43
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
PA power (Up, positive) (A) : 1.55
PA power (Up, negative) (A) : -0.55
PA power (Down, positive) (A) : 0.8
PA power (Down, negative) (A) : -0.28
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Pressure (IMG1) (mbar) : 7.4 E-06
Pressure (old gauge) (mbar) : 2.2 E-05
Pressure (SEC) (mbar) : 4.1 E-06
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Temp (Chiller) deg : -10.1
Temp (chamber) deg : 5.3
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Comments:
==================================================== |
|
159
|
Tue Nov 14 16:00:29 2017 |
CLW, MB, SJL,RG | Run 145 | Header: 5 MeV/u on CH2 33,10,01
Ender: End to allow laser cleaning
====================================================
Run number : 145
Date : 14 / 11 / 2017
Start time : 17:02:01
Stop time : 19:28:30
Trigger rate (MIDAS) : 3
Blocks written : 610
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Run Scalers (approx rates)
0- Ungated : 4
1- Gated : 3
2- dE : 76k
3- E : 95
4- HI : 425
5- Pulser : 1
6- Clock : 968
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Beam energy (MeV/u) : 5.0 MeV/u (nominal)
Beam intensity (epA) : ~2pA
Target : CH2_33+10+01
Ladder position (mm) : 97.61
HI Degrader foil (um) : 15 um
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
del_E voltage (V) : -40
del_E leakage (uA) : 0.54
E voltage (V) : -350
E leakage (uA) : 1.75
E_hi voltage (V) : -14
E_hi leakage (uA) : 2.55
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
PA power (Up, positive) (A) : 1.55
PA power (Up, negative) (A) : 0.55
PA power (Down, positive) (A) : 0.8
PA power (Down, negative) (A) : 0.26
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Pressure (IMG1) (mbar) : 1.2 x 10^-5
Pressure (old gauge) (mbar) : 4.3 x 10^-5
Pressure (SEC) (mbar) : 7.0 x 10^-6
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Temp (Chiller) deg : -10.0
Temp (chamber) deg : +5.2
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Comments:
==================================================== |
|
155
|
Tue Nov 14 08:09:31 2017 |
CLW | Run 142 | Header: Protons are back, continue 3.6 MeV/u on CH2
Ender:
====================================================
Run number : 142
Date : 14 / 11 / 2017
Start time : 09:10:50
Stop time : 10:48:31
Trigger rate (MIDAS) : 6
Blocks written : 436
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Run Scalers (approx rates)
0- Ungated : 5
1- Gated : 5
2- dE : 36k
3- E : 4
4- HI : 500
5- Pulser : 1
6- Clock : 968
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Beam energy (MeV/u) : 3.6 MeV/u (nominal)
Beam intensity (epA) :
Target : CH2_33+10+01
Ladder position (mm) : 97.61
HI Degrader foil (um) : 10 um
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
del_E voltage (V) : -40
del_E leakage (uA) : 0.79
E voltage (V) : -350
E leakage (uA) : 2.09
E_hi voltage (V) : -14
E_hi leakage (uA) : 3.22
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
PA power (Up, positive) (A) : 1.55
PA power (Up, negative) (A) : 0.55
PA power (Down, positive) (A) : 0.8
PA power (Down, negative) (A) : 0.26
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Pressure (IMG1) (mbar) : 6.5 x 10^-6
Pressure (old gauge) (mbar) : 1.8 x 10^-5
Pressure (SEC) (mbar) : 4.2 x 10^-6
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Temp (Chiller) deg : -10.0
Temp (chamber) deg : +6.2
覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧
Comments:
==================================================== |
|
158
|
Tue Nov 14 15:59:42 2017 |
CLW | Run 144 JUNK | valve closed |
|
185
|
Thu Nov 23 13:16:56 2017 |
CLW | Beam energies | Beam energy measurements can be found in the electronic logbook for ISO-REX-HIE
https://op-webtools.web.cern.ch/elogbook/
measurements for all energies were:
E = 4.985 MeV/u. dE (FWHM)= 0.6%
E=4.715 MeV/u, dE(FWHM)=0.6%
E = 4.29 MeV/u dE(FWHM) = 0.5%
E=3.99 MeV/u .Energy spread around 0.5%.
E = 3.61 MeV/u with dE(FWHM) = 0.55% |
|
205
|
Wed Nov 7 14:27:45 2018 |
CBH, DK | Beam Plan for Miguel and Alberto (ISOLDE beam operators) |
Presently, we are scheduled for 9 days:
Nov 26-28 are three (3) days nominally for beam development
Nov 29-Dec 4 are six (6) days nominally for physics data taking
Dec 5-6: Shutdowns and important tests are planned by ISOLDE team
Dec 7th - power gets shut off to ISOLDE
==Run Plan==
1 day for ion source and 2.8 MeV/u beam dev
1 day for High E_cm statistics, using the 2.8 MeV/u beam with 6 um Ti foil. Stop when we are happy with the number of counts we've gotten.
1 day for 1.9 MeV/u energy beam dev (for use with mid E_cm)
1.5 days for Mid E_cm statistics, using the 1.9 MeV/u beam with 3um Ti foil. Stop when we are happy with the number of counts we've gotten.
(Switch back to 2.8 MeV/u beam, takes under 1 hour)
4.5 days for Low E_cm (as long as we can), using 2.8 MeV/u beam and 12.5 um Al foil.
Time must be allocated for He runs and background Ar / empty runs. Ratios of background to reaction runs can be decided depending on the number of counts we see, and also dependent on if we need RP to change gas in the cell.
If 1.9 MeV/u proves too challenging, we may consider to switch to 2.2 MeV/u instead, TBD during machine time.
Over the weekend of 1-2 Dec we cannot change the beam (no operators) nor our target (no RP), so it is crucial we start the low E_cm run before then.
If 1.9 MeV/u beam energy is slightly different that's fine, however it would be preferable if the 2.8 MeV/u beam energy was no lower, especially for the low E_cm run.
---Total 9 days---
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206
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Thu Nov 8 10:01:32 2018 |
CBH, DK | New Struts Installation | Struts arrived and were installed on Wednesday. The holes on one side of each of the struts to connect the wheels to were slightly too wide (11.5 cm vs 10.5 cm).
We've taken away part of the wheel holders and now they seem to be fitting in.
See attached photos:
1. First wheel with wide holder holes
2. Close up of work done
3. Second wheel with wide holder holes (on opposite corner of chamber)
4. Close up of work done
5. Wheel holder that was warped previously
6. Wheel holder that was warped previously, other perspective
7. What chamber looks like as of Wednesday afternoon
8. Lead sheets to make chamber a little bit more secure. |
| Attachment 1: 45572519_266919730834791_8330124242079186944_n.jpg
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| Attachment 2: 45627614_274796576508889_3500579035514142720_n.jpg
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| Attachment 3: 45542395_2324689780898515_4518857653308358656_n.jpg
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| Attachment 4: 45719087_191203315125224_4710983944323989504_n.jpg
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| Attachment 5: 45617345_565825447222151_5971399735796301824_n.jpg
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| Attachment 6: 45552489_494879210995766_5851766338049015808_n.jpg
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| Attachment 7: 45558766_318380375425399_6225540243555090432_n.jpg
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| Attachment 8: 45640419_2077469132528080_1562399133942153216_n.jpg
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190
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Thu Sep 27 11:14:34 2018 |
CBH | Photos and Measurements from August CERN Trip | Chamber frame width=65cm
Chamber frame height=146cm
Chamber frame length=230cm
Centre of mass of chamber (from ground)=173cm
Wheel span=160cm
SEC to wall=124cm
Ventilation box to container (to get to garage)=121cm
Photos of broken ends of struts attached. |
| Attachment 1: 20180823_082444199_iOS.jpg
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| Attachment 2: 20180823_082445833_iOS.jpg
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| Attachment 3: 20180823_082457574_iOS.jpg
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| Attachment 4: 20180823_082505693_iOS.jpg
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203
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Mon Nov 5 13:52:46 2018 |
CBH | CoM energies for 44Ti(alpha,p) reaction for different entrance windows and beam energies | Assuming 200 Torr helium target., elastic and reaction peaks do not have signifcant overlap unless stated:
3um Ti, 1.88 MeV/u beam: Ecm=4.27-4.58 MeV
3um Ti, 2.2 MeV/u beam: Ecm=5.50-5.80 MeV
12.5 Al, 2.8 MeV/u beam: Ecm=3.41-3.72 MeV
2.5 um HAVAR, 1.88 MeV/u beam: Ecm=3.54-3.85 MeV (peaks overlap)
2.5um HAVAR, 2.2 MeV beam: Ecm=4.76-5.06 MeV
6um Ti, 2.2 MeV/u beam: Ecm=3.15-3.47 MeV
6um Ti, 2.8 MeV/u beam: Ecm=5.56-5.86 MeV |
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209
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Mon Nov 12 11:25:58 2018 |
CBH | Expected Proton Energy Plots | Attached are the plots from MC simulations of the energies the detected particles are to have, with the top plot showing the dE-E plot and the bottom plot showing the total energy of the particles.
Please note the height of the peaks is not indicative of the counts expected and there is a low proton background expected between the entrance and exit window elastic peaks - see attached plot from Margerin (2014). |
| Attachment 1: ti_6.00um_2.8MeVu.png
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| Attachment 2: ti_3um_1.88MeVu.png
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| Attachment 3: al_12.5_2.8MeVu.png
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| Attachment 4: Margerin2014elog.png
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79
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Fri Nov 10 01:29:51 2017 |
ASM, MD, DK | run 75 | Header: 4.7 MeV/u and C_09. PS back, but need to check how much beam actually there was before next issue
Ender: no beam at our sample; IHS cavity (part of normal conducting linac) tripped
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Run number : 75
Date : 10/11
Start time : 02:20:11
Stop time : 02:41:21
Trigger rate (MIDAS) :
Blocks written : 77
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Run Scalars (approx rates)
0- Ungated : 2
1- Gated : 2
2- dE : 7
3- E : 2
4- HI : 2
5- Pulser : 967
6- Clock : 0
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Beam energy : 4.7 MeV/u
Beam intensity : 2.0-2.5 pA (in the beginning)
Target : C_09 (Pos #5 - 82.44mm), chosen due to similar thickness as CH2_30+25, as used before
Ladder position : 82.44
HI Degrader foil (um) : 15 um Al
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del_E voltage (V) : -32
del_E leakage (uA) : 0.8
E voltage (V) : -350
E leakage (uA) : 1.75
E_hi voltage (V) : -14
E_hi leakage (uA) : 0.88
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PA power (upstream, positive) : 1.55A
PA power (upstream, negative) : 0.55A
PA power (downstream, positive) : 0.8A
PA power (downstream, negative) : 0.28A
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Pressure (IMG1) : 6.8E-06
Pressure (old gauge) : 1.9E-05
Pressure (SEC) : 3.8E-06
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Temp (Chiller) : -10.1
Temp (chamber) : 5.4 (from before)
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Comments: realised no beam on target after couple of minutes: normal conducting cavity tripped
Alex and Daid try to fix it.
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107
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Sat Nov 11 17:19:54 2017 |
ASM, CL, TD... | halflife | Placed a hand held rad monitor near the faraday cup and took rate readings every 20 seconds, right after inserting the gate valve in front of SEC:
seconds counts/s
0 590
20 499
40 474
60 400
80 353
100 290
120 259
140 234
160 207
180 187
200 175
220 146
240 135
260 124
280 120
300 109
320 107
340 103
360 85
380 86
400 84
420 94
440 81
460 76
480 76
500 74
Then fitted this for half life.
Assuming a steady state background of 70 cps, and using the first 7 data points... the half life comes out as 82.1 +/-3.9 s.
Excellent agreement with known halflife of 59Cu.
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| Attachment 1: Screen_Shot_2017-11-11_at_18.25.54.png
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